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If (M(t)=m+6t) and (M(3)=39), what will (M(8)) be?

Answer and explanation

Correct answer: 69

Given \(M(3)=39\), moving from \(t=3\) to \(t=8\) increases the input by 5. Since \(M(t)\) grows at a rate of 6 per unit, the total increase is \(5\times6=30\). Therefore, \(M(8)=39+30=69\). Option 72 would require an increase of 33, which does not match the given rate. Exam tip: for a linear function, change in output = rate × change in input.

Related tags

Linear FunctionLinear GrowthPolynomial IntroductionRate Of ChangeAlgebraLinear Growth And DecayIntroduction To PolynomialsMathematics

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